Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

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My heater turns on (h100) runs & heats about 20 seconds then turns off

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A big problem with these heaters is the water pressure flowing through your system ..make sure you have sufficent pressure by cleaning all baskets and even inside your pump where the basket goes ...make sure you shut off the power ...this on off thing happened to me before and the solution was insufficent water pressure through the system ...once everything was cleaned out and pressure was up everything ran like new again

Posted on May 11, 2011

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That could be a problem with the ignition sensor. If the sensor fails, the heater won't be able to sense that there is a flame. It thinks the gas is flowing freely without being ignited and cuts the flow of gas as a safety precaution. If you're comfortable tinkering, first CUT THE POWER AT THE BREAKER, then remove the cover and check and clear all the wire connections. Sometimes it's not a faulty sensor but rather just a loose / dirty connection. If that doesn't fix it, call a service tech to check/replace the sensor.

Posted on Jul 15, 2010

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Posted on Jan 02, 2017

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